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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0feb5234e9dacc8fec57927de30096372bbc0bda1516d5b6a20248312532b93c' 
  AND token = 'p8chKzBCiWB2W4SxiCvLhx2uoHnnY6E59jwm/4LWlbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}